/*
* Conditions Of Use 
* 
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain.  As a result, a formal
* license is not needed to use the software.
* 
* This software is provided by NIST as a service and is expressly
* provided "AS IS."  NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY.  NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
* 
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
*  
* .
* 
*/
/************************************************************************************************
 * PRODUCT OF PT INOVACAO - EST DEPARTMENT and Telecommunications Institute (Aveiro, Portugal)  *
 ************************************************************************************************/


package gov.nist.javax.sip.parser.ims;

/**
 * Security Agreement for SIP.
 * <p>headers: Security-Client, Security-Server and Security-Verify</p> 
 * 
 * @author Miguel Freitas (IT) PT-Inovacao 
 */


import gov.nist.core.NameValue;
import gov.nist.core.Token;
import gov.nist.javax.sip.header.SIPHeaderList;
import gov.nist.javax.sip.header.ims.*;
import gov.nist.javax.sip.parser.HeaderParser;
import gov.nist.javax.sip.parser.Lexer;
import gov.nist.javax.sip.parser.TokenTypes;

import java.text.ParseException;



public class SecurityAgreeParser extends HeaderParser
{
	
	public SecurityAgreeParser(String security) {
		super(security);
	}
	
	
	protected SecurityAgreeParser(Lexer lexer) {
		super(lexer);
	}
	
	
	protected void parseParameter(SecurityAgree header)
		throws ParseException 
	{
		if (debug)
			dbg_enter("parseParameter");
		try {
			NameValue nv = this.nameValue('=');
			header.setParameter(nv);
		} finally {
			if (debug)
				dbg_leave("parseParameter");
		}
	}
	

	public SIPHeaderList parse(SecurityAgree header) throws ParseException
	{
	
		SIPHeaderList list;
		
		if (header.getClass().isInstance(new SecurityClient())) {
			list = new SecurityClientList();
		} else if (header.getClass().isInstance(new SecurityServer())) {
			list = new SecurityServerList();
		} else if (header.getClass().isInstance(new SecurityVerify())) {
			list = new SecurityVerifyList();
		}
		else
			return null;
		
			
		// the security-mechanism:
		this.lexer.SPorHT();
		lexer.match(TokenTypes.ID);
		Token type = lexer.getNextToken();
		header.setSecurityMechanism(type.getTokenValue());
		this.lexer.SPorHT();

		char la = lexer.lookAhead(0);
		if (la == '\n')
		{
			list.add(header);
			return list;
		}
		else if (la == ';')
			this.lexer.match(';');
		
		this.lexer.SPorHT();
		
		// The parameters:
		try {
			while (lexer.lookAhead(0) != '\n') {
				
				this.parseParameter(header);
				this.lexer.SPorHT();
				char laInLoop = lexer.lookAhead(0);
				if (laInLoop == '\n' || laInLoop == '\0')
					break;
				else if (laInLoop == ',')
				{
					list.add(header);
					if (header.getClass().isInstance(new SecurityClient())) {
						header = new SecurityClient();
					} else if (header.getClass().isInstance(new SecurityServer())) {
						header = new SecurityServer();
					} else if (header.getClass().isInstance(new SecurityVerify())) {
						header = new SecurityVerify();
					}

					this.lexer.match(',');
					// the security-mechanism:
					this.lexer.SPorHT();
					lexer.match(TokenTypes.ID);
					type = lexer.getNextToken();
					header.setSecurityMechanism(type.getTokenValue());

				}
				this.lexer.SPorHT();
				
				if (lexer.lookAhead(0) == ';')
					this.lexer.match(';');
				
				this.lexer.SPorHT();
				
			}
			list.add(header);
			
			return list;
			
		} catch (ParseException ex) {
			throw ex;
		}
		
		
	}
	
	

		
}

	
